Smoke detector



FIG. 1 is a perspective view of the smoke detector according to the present invention;

FIG. 2 is a top plan view of the smoke detector on a reduced scale;

FIG. 3 is a front elevational view of the smoke detector on a reduced scale;

FIG. 4 is a bottom plan view of the smoke detector on a reduced scale. 

The ornamental design for a smoke detector, substantially as shown and described. 